Arc-lamp



M. J. WOHL.

ARC LAMP.

APPLICATION FILED NOV.-23. 1911. 1,319,825. Patented Oct. 28,1919.

3 2 SHEETSSHEET 1. P w a .1. v I v 1 I ZZT -P'LLA UNITED STATES PATENT OFFICE.

MAURICE J. WOI-IL, or BROOKLYN, NEW YORK, AssIeNoR TO M. J. worn. & commiw,

me, A CORPORATION on NEW YORK.

ARC-LAMP.

Specification of Letters Patent.

Patented Oct. 28, 1919.

Application filed November 23, 1917. Serial No. 203,500.

To all whom it may concern:

Be it known that I, MAURICE J. WOHL, a citizen of the United States, and resident of Brooklyn, city of New York, county of Kings, and State of New York, have invented certain new and useful Improvements in Arc-Lamps, of which the following is a specification.

This invention relates, generally, to electric arc lamps and more particularly, in some features thereof, to multiple arc lamps in which a unitary mechanism is employed to control severalarcs.

The invention has for a general object to provide a unitary and self contained arc lamp in which the control mechanism is widely separated from and also heat-insulated from the are or arcs.

The invention has for another object to provide a multiple arc of this type lamp in which the different carbon pairs; are located in separate compartments.

A further object is to provide an arc lamp which the mechani'sm is separate and heat insulated from the are or arcs.

Other objects relate to the construction of the arc lamp casing in special sections for provision of the separate chambers and also to the generalarrangement of parts looking to simplicity of construction and regular feed of the carbons.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description taken in connection with the accompanying drawings in which I have illustrated a preferred embodiment of the invention, the various novel features being wmoreparticularly pointed out in the appended claims. a

Figure 1 of the drawings is a longitudinal vertical sectional view of an arc lamp embodying theinvention, this view being taken on the line l-lof Fig. 2.

Fig. 2 is a horizontal sectional on the line 2 2 of Fig.1.' Fig. 3 is a transverse vertical section on the line 3-8of Fig. 1., U

Fig. 4: .is a transverse vertical section on the-line44ofFig. 1. p 1 I In the present embodiment of the invenview taken .tion the main frame of my improved arc lamp comprises an upper casting 1 5 and ,lowercasting,12,-each\of .',oblong,i.forln in plan view. These casting s are rigidly so 1 is a solenoid 6, which may be secured to the upper casting in any suitable manner.

In the present instance the solenoid is mounted between a pair of horizontal plates 7 7 fixed'to a pair of vertical rods 8, 8 whose upper ends are rigidly secured to the casting 1. The lower ends of these rods extend downwardly below the solenoid and have attached thereto a shelf 9 upon which is mounted, co-axially with the solenoid 6, a dash-pot 10 whose plunger 11 is connected to the core 12 of the solenoid 6.

I prefer to provide a resilient connection between the plunger 11 and core 12, this connection being here in the form of a pair of vertically spaced and horizontally extending flat springs 13 and 14 connected, respectively, midway between their ends, to the upper end of the plunger 11 and the lower endof the core 12, and secured together at their ends as by the studs 15. It will be apparent that the solenoid and dash pot are mounted on a common subsidiary frame readily detachable from the main" frame without disruption of the latter.

, My improved lamp, as here embodied, comprises two pairs of carbons, or, broadly speaking, two are forming devices. These are forming devices are located on opposite sides of the solenoid 6 and are controlled thereby and comprise upper carbons 20, 20

'fixedin' vertically adjustable sockets 21, 21'

and lower carbons, 22, 22 fixed in stationary sockets 23,23. The lower sockets 23, 2 3" are here shown as mounted on theends of fixed lateral arms 24, 2 1' secured to and insulated from a plate 25 carried rigidly bytheposts 3 and 4.

The upper sockets 21 and 21 emceelateral arms 28', i28",-l1a. ViI;1g the respective sockets 21, 21 on their ends; Fixed to each of the crossheads and extending downwardly therefrom between the respective pairs of posts are rods 30, 30, which I term dummy carbons, and which are adapted to be engaged by clutches and so control the carbons.

As here shown, a transverse bar 35 is fixed midway between its ends to the spring 13 and is connected at its ends to the upper ends of a pair of longitudinally resilient rods whose lower ends are attached to clutches 37, 37 of any well known construction, which engage the dummy carbons. I have here shown these longitudinally resilient rods as comprising upper and lower rigid members 38, 38 and 39, 39 joined together by the angular springs 10, which are secured at opposite ends to the respective member 38, 38 and 39, 39, this type of resilient rod being fully described and illustrated in a previous patent issued to me July 31, 1917, under No. 1,235,271.

The resistances with which are lamps are provided I have here shown at 14; as secured to and depending from a plate 15 carried by the posts 3, 1, below the control mechanism just described. To provide for easy attachment and detachment of the resistances I have shown the plate 45 as provided with key-hole apertures 16 through which pass the headed screws 47 which are threaded into the ends of the resistance spools.

As will be apparent from the above description, the arcs are widely separated from the control mechanism, and, to further insulate the latter from the heat of the arcs, I provide heat insulating partitions which divide the arc lamp easing into the central compartment, containing the control mechanism, and side chambers, containing the arcs.

In the present instance, I effect this by means of a channel-shaped partition member 50 which incloses the control mechanism'on the front and sides of the latter and may be secured, as by screws 51, to the plate 45. Each leg of this member 50 is cut away at its lower end, as at 52, to receive the adjacent fixed carbon supporting arm, and vertically slotted as at 53, for approximately the upper half of its length, to accommodate the movable carbon supporting arm.

The main inclosing casing of the arc lamp is carried by the castings 1 and E2 and comprises a back portion 55 and side portions 56. this casing inclosing the arcs on back and sides of the lamp. The arcs, as will be apparent, are disposed in side chambers in this casing on either side of the compartment formed by the partition member 50 in which the control mechanism is located.

' The castings 1 and 2 are merely skeleton frames, as clearly shown, and the side compartments in which the arcs are located are thus-open at top and bottom to assist in the rapid carrying off of the heat from the arcs.v

The ventilation of the central compartment containing the control mechanism may be assisted by perforating that section of the back 55 of the main casing within the confines of the partition 50, as indicated at 58.

The front of the casing may be provided with a flaring member 60 carrying in its forward end a slide 61 which may be employed to shut off the light from one of the arcs when desired.

The walls of the side chambers in Which the arcs are located serve also as reflectors, as will be apparent, the invention being here embodied in an arc lamp designed more particularly for use in motion picture work or for other illumination for photographic purposes.

I have not considered it necessary to illustrate the electrical connections, which may be through the solenoid down one pair of carbons, through the resistances and up through the other pair of carbons, the insulated arms 24 and 28 forming the medium for connection to the carbons.

As a convenient way of detachably mounting the lamps I have provided the castings 1 and 2 with vertically perforated legs 65 and 66 adapted to receive freely a post 67 projecting rigidly upwardly from a saddle 68 on the upper end of a standard 69, the saddle being shaped to fit the bottom of the casting 2, which rests thereon.

As will be apparent, when the lamp is in operation, the clutches 37, 37 will engage the dummy carbons 30, 30 and the latter will cause the cross heads 26, 26 through the arms 28 and 28 to regulate the arcs as the carbons burn away.

What I claim is 1. An arc lamp provided with an oblong casing, a pair of are forming devices located in said casing one near each end thereof, unitary control mechanism for said are forming devices and located between the latter, and a channel-shaped partition member inclosing said control mechanism with its legs extending toward the back of the casing.

2. An arc lamp provided with an oblong casing, a pair of are forming devices located in said casing one near each end thereof, unitary control mechanism for said are forming devices and located between the latter, and a channel-shaped partition member inclosing said control mechanism with its legs extending toward the back of the casing, that portion of the back of the said casing within the confines of the said legs being perforated.

3. In an arc lamp, a pair of are forming: devices, unitary control mechanism therefor locatedbetween said devices, and heat insulating partitions interposed between said are forming devices and control mechanism.

4. An arc lamp provided with an oblong casing divided longitudinally into a central compartment and a plurality of side chambers, an are forming device located in each of the side chambers, and a unitary control mechanism located in the central compartment for said are forming devices.

5. All are lamp provided with an oblong casing divided longitudinally into a central compartment and a plurality of side chambers open at the top and bottom to provide for air circulation, an are forming device located in each of the side chambers, and a unitary control mechanism located in the central compartment for said are forming devices.

6. An arc lamp provided with an oblon casing divided by partitions into a centrfi dummy carbons into each of said side chambers, the said partition being vertically slotted to permit of vertical movement of said arms.

Signed at city of New York, county of Kings and State of New York, this 13th day of November, 1917.

MAURICE J. WOHL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Iatents, Washington, D. G. 

